which gases travel the fastest

Question

I WANT TO KNOW WHAT GAS TRAVELS FROM SLOW TO FAST BEING CL2 HE AR  CO2 O2 NE XE

Answer 1

You want to look up and read about Graham's Law of Effusion of gases.  It states that the rate of effusion is inversely related to the square root of the molar mass.  This is the same as what Arturo stated in his answer.

 

rate gas1/rate gas2 = sqrt MW gas2/sqrt MW gas1

 

So order molar masses of the gases from heaviest to lightest and that will be the order for slowest to fastest.

 

Also not that you should use proper symbols such as Cl2 (not CL2), He (not HE), Ar (not AR), Ne, Xe, etc.

Answer 2

That depends.  Do the molecules of the various gases have the same kinetic energy?  If so, then the lighter gases travel faster.  Find the masses of the gas molecules and order them from higher to lower mass, and that will be the order of increasing speed.